Venting For Combustion Air - Navien NHB H Series Installation And Operation Manual

5. Venting for Combustion Air

Additional Guidelines for Combustion Air
WARNING
Carbon Monoxide Hazard
The installation of carbon monoxide detectors
may be required in your area for the boiler or
other gas fired appliances. Check applicable
codes for the installation location of the boiler.
Carbon monoxide detectors should comply
with NFPA 720 and be ANSI/UL 2034 listed and
IAS certified.
Combustion air piping to the outside is
●
recommended. (Direct Venting)
The boiler may be installed with a single pipe
●
carrying the flue products to the outside while
using combustion air from the equipment room.
In order to use the room air venting option on
page 58, specific conditions and considerations
must be followed.
WARNING
To prevent death, serious injury, or property
damage:
Do not install the boiler or combustion
●
air piping in areas with contaminated
air(containing a high level of dust, sawdust,
sand, flour, aerosols, fluorine or chlorine
compounds), as contaminants can cause
severe problems.
Pool and laundry products and common
●
household cleaning products can contain
corrosive compounds. If any of the chemicals
or vapors enter the boiler, this can result in
serious product damage that can even cause
the potential for flue gas leakage in extreme
cases.
To prevent the potential of severe personal
injury or death, check for areas and products
listed in the following tables before installing
the boiler or air inlet piping.
If contaminants are found in the combustion
air, you MUST Remove contaminants
permanently or Relocate air inlet and vent
terminations to other clean areas.
If you must install the boiler in an area with
●
contaminated air, use direct venting to
supply clean air from outside the building.
We recommend regular filter cleaning and
maintenance in these areas.
52 Venting for Combustion Air
The warranty does not cover damage
Note
caused by air contaminants.
Corrosive Contaminants
Muriatic acid/hydrochloric acid
Refrigerant leaks
Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
Varnish removers or paint
Adhesives used to fasten building products and
other similar products
Chlorine-based swimming pool chemicals
Permanent wave solutions
Anti-static fabric softeners used in clothes dryers
Calcium chloride used for thawing
Spray cans containing chloro/fluorocarbons
Cements and glues
Sodium chloride used for water softening
Chlorinated waxes/cleaners
Corrosive Sources
Remodeling areas
Refrigeration repair shops
New building construction
Metal fabrication plants
Laundry areas and establishments/dry cleaning
Swimming pools
Auto body shops
Furniture refinishing areas and establishments
Garages with workshops
Plastic manufacturing plants
Beauty shops
Photo processing plants